Rule:
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Sid:
104
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Summary:
Dagger is a Trojan Horse.
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Impact:
Possible theft of data and control of the targeted machine leading to a
compromise of all resources the machine is connected to. This Trojan
also has the ability to delete data, steal passwords and disable the
machine.
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Detailed Information:
This Trojan affects the following operating systems:
Windows 95
Windows 98
Windows ME
Windows NT
Windows 2000
Windows XP
No other systems are affected. This is a windows exceutable that makes
changes to the system registry, Win.ini and System.ini. When first
executed the Trojan replicates itself and in most cases, gives the copy
a random name. This Trojan may use the file extensions ".exe" or ".dll".
The Trojan changes system startup files and registry settings to add the
server to programs normally started on boot.
SID Message
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104 Dagger_1.4.0_client_connect (incoming TCP connection)
105 Dagger_1.4.0 (outgoing TCP connection)
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Attack Scenarios:
This Trojan may be delivered to the target in a number of ways. This
event is indicative of an existing infection being activated. Initial
compromise can be in the form of a Win32 installation program that may
use the extension ".jpg" or ".bmp" when delivered via e-mail for
example.
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Ease of Attack:
This is Trojan activity, the target machine may already be compromised.
Updated virus definition files are essential in detecting this Trojan.
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False Positives:
None Known
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False Negatives:
None Known
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Corrective Action:
This is a particularly difficult Trojan to remove and should only be
attempted by an experienced Windows Administrator.
Edit the system registry to remove the extra keys or restore a
previously known good copy of the registry.
Affected registry keys are:
[HKEY_CLASSES_USER\Software\Microsoft\Windows\CurrentVersion\RunServices]
[HKEY_CLASSES_USER\Software\Microsoft\Windows\CurrentVersion\Run]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
Registry keys added are:
"SysManager"="C:\\WINDOWS\\System\\Manager.exe"
Removal of the file Manager.exe is required. Also end the process
Manager.exe.
A machine reboot may be required to clear the existing process from
running in memory.
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Contributors:
Original Rule Writer Max Vision <vision@whitehats.com>
Sourcefire Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>
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Additional References:
Whitehats arachNIDS
http://www.whitehats.com/info/IDS484
TLSecurity
http://www.tlsecurity.net/backdoor/Dagger.1.4.html (link appears to be
inactive)
Dark-e
http://www.dark-e.com/archive/trojans/dagger/140/index.shtml
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